Advanced Pure Water & Membrane Equipment Lineup
Engineered to international ASME, ISO, and CE standards: Skid-mounted, automated demineralized and deionized water generation plants direct from our Shanghai manufacturing facility.
Technical Clarification: Deionization (DI) vs. Demineralization (DM)
A rigorous engineering perspective on ionic depletion, electrical resistivity, and multi-stage separation architectures for industrial buyers and plant engineers.
Demineralized (DM) Water
Demineralization refers to the general reduction of dissolved inorganic mineral salts (cations like Ca²⁺, Mg²⁺, Na⁺ and anions like Cl⁻, SO₄²⁻, HCO₃⁻). Historically executed via dual-bed ion exchange resins, modern industrial standards employ double-pass Reverse Osmosis (RO) to achieve conductivity values between 1.0 to 10.0 µS/cm, optimized for thermal boilers, cooling towers, and heavy chemical synthesis.
Deionized (DI) Water
Deionization targets total ionic purification, eliminating virtually all mineral ions down to microscopic trace levels. Achieved through mixed-bed polishing or Continuous Electrodeionization (CEDI), DI water achieves theoretical maximum resistivity of up to 18.2 MΩ·cm at 25°C. Crucial for semiconductor wafer micro-rinsing, lithium battery slurry preparation, and API pharmaceutical formulations.
Continuous Membrane Technology (CEDI)
By blending electrodialysis with ion-exchange membranes, CEDI provides continuous self-regeneration under a direct current electrical field. This eliminates the storage, risk, and OPEX of hazardous chemical regenerants (HCl and NaOH), ensuring 100% stable uptime, zero chemical neutralization waste, and green ESG compliance across global supply lines.
Global Market Outlook & Enterprise Procurement Drivers
Strategic demand shifts shaping high-purity water infrastructure investments across North America, Europe, the Middle East, and Asia-Pacific.
Micro-Contaminant Sensitivities
Advanced sub-nanometer semiconductor nodes, EV gigafactories, and synthetic biotechnology require non-detectable levels of reactive silica, boron, and dissolved TOC (Total Organic Carbon). Procurement teams prioritize systems offering integrated online analytical validation, degassing membranes, and secondary polishing loops.
Modular Containerization & Plug-and-Play
Faced with volatile local civil construction costs and lengthy EPC lead times, multi-national developers seek pre-assembled, containerized DI/DM water skids. Pre-wired, pre-piped, and subjected to rigorous Factory Acceptance Testing (FAT), these systems compress on-site installation schedules from months to days.
Total Water Stewardship & ZLD Integration
Stricter regional municipal discharge constraints are pushing plants to integrate DI/DM systems with high-pressure Osmosis-Assisted Reverse Osmosis (OARO) and thermal crystallization, turning the reject streams of pure water production into reclaimed operational water and reusable dry salts.
18.2 MΩ
Peak Resistivity for Electronic Grades
> 99.5%
Dissolved Salt Rejection Efficiency
38+
Proprietary Utility & Invention Patents
15 Days
Fast-Track Skid Commissioning Window
China Factory 4.0: Manufacturing Prowess & Global Supply Chain Resilience
How Shanghai Tongjie combines cutting-edge engineering standards, direct factory wholesale economics, and end-to-end quality controls to deliver unparalleled customer value.
Integrated EPC Engineering
Founded in 2010, Tongjie holds Class II contracting credentials in Environmental Protection Engineering and Mechanical & Electrical Installation. We operate with complete vertical cohesion: from chemical process simulation and 3D piping layout to full skid structural fabrication.
Certified Global Quality
Our production facilities operate strictly within ISO 9001, ISO 14001, and ISO 45001 management frameworks. Every deionization skid, EDI stack, and RO housing carries comprehensive CE compliance, ensuring frictionless importation and regulatory approval across Europe and the Americas.
Full-Scale FAT Testing
Prior to sea freight dispatch, each industrial demineralized water unit undergoes complete hydrostatic, electrical logic, sensor calibration, and wet-testing at our Shanghai facility, completely de-risking overseas project deployments and preventing unforeseen site delays.
Direct Wholesale Advantage
By eliminating multiple tiers of international distributors and intermediaries, we offer tier-one membrane technologies (including Dow/DuPont, Hydranautics, and high-spec proprietary elements) directly to global EPC contractors at wholesale factory direct pricing.
Industrial & Localized Use Cases
Customized ionic purity configurations engineered around exact regional feedwater chemistry and industry compliance demands.
Semiconductors & Photovoltaics
Integrated RO-EDI coupled with micro-degassing contactors to strip dissolved O₂ and CO₂, followed by ultrafiltration to ensure zero particulate contamination and resistivity >18 MΩ·cm for wafer and cell fabrication lines.
Power Generation & High-Pressure Boilers
Complete demineralization trains targeting reactive silica <10 ppb and sodium <5 ppb. Prevents high-temperature silicate scaling, boiler tube blowouts, and turbine blade fouling in combined-cycle power facilities.
Biopharma & cGMP Compliant Systems
Sanitary stainless steel 316L construction with automated hot-water sanitization (85°C), zero-dead-leg orbital welding, and continuous TOC tracking to meet USP/EP Purified Water and WFI (Water For Injection) compliance.
Frequently Asked Questions (Technical & Procurement FAQ)
Direct technical answers addressing system sizing, electrical specs, shipment logistics, and membrane life optimization.
How do I determine whether my facility needs a Demineralized (DM) or Deionized (DI) system? +
The selection depends strictly on your process purity tolerance. If your facility requires general mineral prevention (e.g., boiler feed water, chemical cooling systems) with conductivity between 1-10 µS/cm, a double-pass RO or dual-bed demineralizer is sufficient. If your manufacturing process involves semiconductor rinsing, battery electrolytes, or medical synthesis requiring resistivity from 1 to 18.2 MΩ·cm, a Deionized Water system featuring CEDI or mixed-bed polishing is mandatory.
What are the advantages of choosing Continuous Electrodeionization (CEDI) over traditional mixed-bed resin tanks? +
Traditional mixed-bed resins require recurring chemical regeneration utilizing dangerous hydrochloric acid and caustic soda, causing chemical handling risks, operational downtime, and wastewater neutralization costs. CEDI operates continuously via electrical self-regeneration without chemicals, provides consistent ultra-high water quality, requires a 60% smaller physical footprint, and significantly reduces ongoing operational expenditure (OPEX).
What raw water parameters are mandatory for Tongjie to generate an engineered design proposal? +
To deliver an accurate process train and mass balance quotation, our engineers need: a complete water analysis report (including Total Dissolved Solids [TDS], conductivity, total hardness, silica content, chloride, and SDI), target flow capacity (m³/h or GPD), final purified water spec (conductivity or resistivity), site voltage/frequency, and your desired footprint (skid-mounted or ISO shipping container).
Can Tongjie skid-mounted and containerized water plants operate in extreme desert or marine conditions? +
Yes. We engineer customized units equipped with insulated, climate-controlled container enclosures, heavy-duty anti-corrosion marine epoxy coatings, Duplex stainless steel (2205/2507) high-pressure manifolds, and remote SCADA IoT platforms engineered to reliably handle ambient temperatures from -20°C to +55°C in regions such as the Middle East, Central Asia, and offshore sites.
What quality assurance certifications accompany international orders? +
Every Tongjie unit is manufactured under ISO 9001, ISO 14001, and ISO 45001 standards and is certified with European CE declarations. Overseas shipments are provided with full Factory Acceptance Testing (FAT) records, material certificates, component manuals, electrical schematics, and optional 3Q (IQ/OQ/PQ) pharmaceutical validation support.
Specialized Industrial Systems & Membrane Solutions
Explore our targeted industrial solutions for food and beverage purification, degassing, ZLD wastewater concentration, and low-conductivity industrial demineralization.
